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1992 15hp Carb Gaskets

5

51lyman

Member
"The BRP exploded diagram for

"The BRP exploded diagram for my 1992 15hp shows three stacked gaskets for mounting the carb. I actually have three paper gaskets, though only one comes with the Sierra carb kit. Should I stack the three I have or just use one??
Thanks for the help!"
 
"You are a bit 'off' b

"You are a bit 'off' but not surprised!
The BRP catalog shows 2 gaskets and an aluminum restriction (#40), which does not even carry a part number.
The reason is simple. In some countries, due to tax-rules and age limit rules on horse power, the 15R were sold as 9,9 with the restriction plate factory installed. They were called 10"GT" and 10 "XP" Then it was just for the purchaser to rip out the plate and one gasket -and voila -there was a 15 HP engine! Similar tricks were used by all major manufacturers.
Shortly: You only need the 1 gasket from Sierra!"
 
Interesting info - thanks! Do

Interesting info - thanks! Do you know if restrictor plates like that were used in the US or Canada? I wonder how many motors could be upgraded by such a simple change?
 
"Who knows, except the factory

"Who knows, except the factory, where all engines ended up. They were targeted for specific markets, but I guess excess production were dumped off at different places. It is rather easy to spot the alu plate between the two gaskets without removing the carb. later, with the 'new' model, they needed to switch carbs for some years, then they made a port difference in the block in addition. It was all a jungle! A similar thing happened on the Italian market, where there seems to be a 'limit' on 25 Hp. You could buy 40/50 engines rated down to 25, even some 3 cyl 60/70! The 3 cyl 35 was the latest one of that type which was down rated to 25."
 
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